Machine for mechanically enameling baths or other metal objects.



Patented Oct. 7, I902.

P. DUPONT. MACHINE FOR MEGHANIGALLY ENAME-LING BATHS OR OTHER METAL OBJECTS (Appliution filed Apr. 23. 1902.)

2 SheetsSho ot I.

(No Model.)

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No. 710,443. Patehted Oct. 7, I902.

. DUPONT. MACHINE FOB MECHANIGALLY ENAMELING BATHS OR OTHER METAL OBJECTS.

(Application filed Apr. 23. 1902.)

2 Sheets-Shoat 2.

UNITED STATES PATENT OFFICE.

PAUL DUPONT, OF LE OATEAU, FRANCE.

MACHINE FOR MECHANICALLY ENAMELING BATHS OR OTHER METAL OBJECTS.

SPECIFICATION forming part of Letters Patent No. 710,443, dated October '7, 1902.

Application filed April 23,1902.

To (all whom it may concern.-

Be it known that I, PAUL DUPONT, a citizen of the Republic of France, residing in Le Oateau, Nord, France, have invented certain new and useful Improvements in Machines for Mechanically Enameling Baths or other Metal Objects, of which the following is a specification.

Heretofore considerable difficulty has been experienced in mechanically enameling objects of metal by facing by reason of the different shapes which such objects or articles possess. This method,however,has been possible in the case of articles or objects having plane surfaces and even convex surfaces; but it has not been possible to enamel objects having concave surfaces.

The machine forming the subject of this invention enables the enameling-powder to be spread over the interior of the baths or other metal articles or objects.

Figure 1 is a front elevation of the machine, the casing being cut away to show the internal mechanism. Fig. 2 is a side view thereof; and Fig. 3 is a plan view of the drum and of the striking device.

The machine consists of a metal chamber, one side a of which is fixed, while the other three sides A are movable in a vertical direction under the action of rods 1), attached to a frame 0, suspended by chains. The whole is counterbalanced or equilibrated by a counterweight. The chamber is closed at its upper part by a top or root d of two sloping parts hinged at the top and to which are attached the controlling-chains. Under the top (1 is horizontally arranged a screen 6, carried by the fixed side a of the chamber and the posts shown at the sides thereof in Fig.1. This screen is formed of three screen-bandsf g h, separated. by solid portions. Above the screen e are arranged two frames, about fifteen centimeters apart and divided into square compartments, formed by flat bands 7: longitudinally and transverselyarranged. These two frames are connected together at each angle of the frames by vertical rods :0. Upon the rods 00 of the frames there operate strikers j, of which some are simple fingers j and others are provided with hammers The strikers j are actuated by cams 70, mounted helically upon two shafts Z Z, disposed on each side of the Serial No. 104,331. (No model.)

screen 6, so as to strike consecutively and without cessation on different points of the surface of the screen. The shafts Z Z are actuated by sprockets and chains driven from a winch m by means of sprockets 9 and 10 and clutches 11 and 12. Motion may be given to the two shafts Zor to one or other of these said shafts by suitable sprockets 5 and 6 and clutches 7 and 8 if itis only desired to apply the enamel upon a part of the surface situated below the screen. I

The object or article to be enameled,which must be turned in all directions, is arranged upon a rotary and pivoted table 0, provided underneath the screen 6. This table 0 has formed with it a toothed wheel p,which gears with a pinion q, actuated by the winch m. This toothed Wheel p turns upon a pivot carried by a cross-piece 0, having pivots which are supported in bearingsin supports. The cross-piece r carries a strong rod, which has at its end a counterweight 25, adapted to equilibrate or counterbalance the article or object to be enameled and which is placed upon the table 0. The counterweight iis connected at one side to a rod "Lt, attached to a lever c, which is operated for inclining therotating table according to necessity, and thus to present all parts of the object to be enameled.

\Vhen it is desired to fix the table during the operation of applying the enamel, the

driving-sprocket 'n is disengaged by means of the clutch 13. During this time the hammers or strikers continue to operate.

In the case where the object to be enameled is a bath it is rested upon the supports 3 of the table 0 and it is fixed on one side by means of two supports w, one end of each of which is screw-threaded, whereby they can be engaged in holes formed in the table 0, being secured thereto by nuts. The arms or girdles are movable upon the supports to, whereby it is possible to employ girdles which exactly correspond to the shape of the object to be enameled in order that it may be fixed rigidly upon the table 0. Opposite the aforesaid supports there are mounted clamping devices l, which engage in guides formed in the table 0. The article or object to be enameled pressing against the point 2 causes a considerable pressure of the squared end of the device Z on the horizontal plate 2, (shown in too dotted lines in Fig. 2,) and thus rigidly fixes the clamping device in any position which it may be given. To disengage the clamping device, a slight pull is exerted by means of a hook at the point 4, so as to cause it to slide, the said device on reaching the end of its path falling automaticallyand assuming the horizontal position indicated in dotted lines in Fig. 2, whereupon the article or object is free. This is a well-known form of clamp,

and need not, therefore,be describedin detail.

I claim A machine for speading enamel upon the inside of baths and other hollow objects, comprising, in combination, a chamber having a plurality of sides adapted to be raised and one side which is fixed, a screen comprising witnesses.

PAUL DUPONT. Witnesses:

Z. BRAUNN, G. BRAUN. 

